38(3 
THE VOYAGE OE H.M.S. CHALLENGER. 
Grube first described this species in 1877 from specimens collected by the German 
exploring ship “ Gazelle.” No information is given in regard to its habitat. 
Trophonia wyvillei, n. sp. (PI. XLIV. fig. 6 ; PL XXIIIa. figs. 11-14 ; PI. XXXVIa. 
figs. 5-7 ; PI. XXXVIlA. fig. 1). 
Habitat . — Trawled at Station 157 (midway between the most southern Station and 
Australia), March 3, 1874 ; lat. 53° 55' S., long. 108° 35' E.; depth, 1950 fathoms ; bottom 
temperature 32°T, surface temperature 37°’2 ; sea-bottom. Diatom ooze. 
The single specimen has a length of 73 mm., and a breadth at its widest part of 28 
mm. The frontal bristles extend about 30 mm. from base to tip, so that the extreme 
length of the animal and its bristles is about 100 mm. 
The shape of the body, which is of a dusky grey colour like the ootQ, is broadly 
elliptical or somewhat fusiform, widest about the middle and tapering to each end. The 
truncated anterior extremity has a slight median projection, from which the purplish 
frilled tentacles proceed. Posteriorly the gradual narrowing gives the end the form of 
a blunt cone. The entire surface is covered with a dense coating of pale filiform 
cilia or papillae of great length, the tips being smoothly rounded. The surface thus 
appears like a piece of plush or loose grey felt. The long papillae have a central 
granular axis of li 5 ^oderm, and a translucent external investment of cuticle. The 
structures, however, are so densely coated with the organisms of the Diatom 
ooze which the animal inhabits, that only comparatively short portions are avail- 
able for inspection. Along the entire process, from base to tip, large and small 
sponge-spicules. Diatoms, and fragments of Diatoms and Kadiolarians, with siliceous 
granules of various kinds, are closely arranged. The composition of these extraneous 
organisms is mainly siliceous, and the addition of hydrochloric acid makes little alteration. 
When spirit was first poured over the body of the animal, a slightly milky appearance 
was given to the liquid as it emerged from the “felt” at the sides, from the immense 
number of the minute organisms just alluded to. Indeed under a lens the tips of the 
papillae appear to be matted together, especially on- the ventral surface, from the abund- 
ance of the Diatom ooze, and individual papillae are rendered more or less clavate from 
the same reason. 
The oral aperture is ventral in position, the anterior margin of the frilled tentacles 
only being seen from the dorsum. It is surrounded by an elevated barred rim, rendered 
more conspicuous by the sulcus which exists at its base, and the raised bosses forming 
each anterior angle of the body, A brown pigment-band occurs round the oral frill. 
Projecting from the ajDcrture are the very large foliaceous tentacles, which are furrowed 
ventrally. Each tentacle is still tinted of a brownish-purple on the dorsum, and when flat- 
